EP 0244584 A3 19880720 - COOLING WATER CORROSION INHIBITION COMPOSITION
Title (en)
COOLING WATER CORROSION INHIBITION COMPOSITION
Publication
Application
Priority
US 86176386 A 19860509
Abstract (en)
[origin: EP0244584A2] A method for inhibiting corrosion in industrial cooling waters which contain hardness and a pH of at least 6.5, by dosing the water with a composition which comprises a water-soluble inorganic phosphate capable of inhibiting corrosion in an aqueous alkaline environment and a hydrocarbon polymer containing an N-substituted acrylamide polymers with an amide structure as follows: <CHEM> where R2 is hydrogen or methyl, where R1 is a hydrogen or an alkyl and R is alkylene or phenylene, and X is sulfonate, (poly)hydroxyl, (poly)carboxyl or carbonyl, and combinations thereof; or containing derivatized maleic anhydride homo- co- and terpolymers having N-substituted maleamic acid units, N-substituted maleimide units and maleic acid (and salts) units having a structure as follows: <CHEM> where R1, R2 and R3 are each independently chosen from the group consisting of hydrogen, hydroxyl, carboxyalkyl, carboxyamide, phenyl, substituted phenyl, linear or branched alkyl of from one to ten carbon atoms, and substituted alkyl of from one to ten carbon atoms, where the substituent is phosphonic acid; phosphinic acid; phosphate ester; sulfonic acid; sulfate ester, carboxyamide, (poly)carboxy and (poly)hydroxy, alkoxy and carboxylate ester groups; and combinations thereof.
IPC 1-7
IPC 8 full level
C23F 11/167 (2006.01); C09D 5/08 (2006.01); C09D 133/24 (2006.01); C09D 135/00 (2006.01); C23F 11/08 (2006.01); C23F 11/173 (2006.01); C23F 11/18 (2006.01)
CPC (source: EP US)
C09D 5/08 (2013.01 - EP US); C09D 133/24 (2013.01 - EP US); C09D 135/00 (2013.01 - EP US); C23F 11/08 (2013.01 - EP US); C23F 11/173 (2013.01 - EP US)
Citation (search report)
- [X] GB 2124607 A 19840222 - KATAYAMA CHEMICAL WORKS CO
- [X] US 4297237 A 19811027 - BOFFARDI BENNETT P
- [X] EP 0155846 A2 19850925 - GRACE DEARBORN LTD [GB]
- [A] WO 8302628 A1 19830804 - DEARBORN CHEMICALS CO [US]
- [A] EP 0122013 A1 19841017 - CALGON CORP [US]
- [A] FR 1544503 A 19681031 - BENCKISER GMBH JOH A
- [A] FR 2288113 A1 19760514 - ANVAR [FR]
Designated contracting state (EPC)
AT BE CH DE ES FR GB GR IT LI NL SE
DOCDB simple family (publication)
EP 0244584 A2 19871111; EP 0244584 A3 19880720; EP 0244584 B1 19920729; AT E78882 T1 19920815; AU 597972 B2 19900614; AU 7247887 A 19871112; BR 8702350 A 19880217; CA 1330390 C 19940628; CN 1034684 C 19970423; CN 87103379 A 19871216; DE 3780692 D1 19920903; DE 3780692 T2 19921210; DK 171302 B1 19960826; DK 234887 A 19871110; DK 234887 D0 19870508; ES 2042509 T3 19931216; FI 872003 A0 19870506; FI 872003 A 19871110; FI 93738 B 19950215; FI 93738 C 19950526; GR 3005830 T3 19930607; JP H0143838 B2 19890922; JP S63121682 A 19880525; MX 170512 B 19930827; PT 84847 A 19870601; PT 84847 B 19900208; TR 25006 A 19920826; US 4752443 A 19880621; ZA 873304 B 19871102
DOCDB simple family (application)
EP 87103070 A 19870304; AT 87103070 T 19870304; AU 7247887 A 19870504; BR 8702350 A 19870508; CA 536674 A 19870508; CN 87103379 A 19870508; DE 3780692 T 19870304; DK 234887 A 19870508; ES 87103070 T 19870304; FI 872003 A 19870506; GR 920402161 T 19920930; JP 11340787 A 19870509; MX 638687 A 19870507; PT 8484787 A 19870508; TR 37687 A 19870508; US 86176386 A 19860509; ZA 873304 A 19870508